The attack. Nbc bay areas jean elle is in San Francisco with the exclusive story and video. Jean, what do we know . Reporter raj, construction is impacting traffic here during the day. The woman who directs traffic says this morning an angry man got out of his car and start swinging. What looks like a street brawl in San Francisco is a crowd of people trying to get an enraged driver away from a construction worker. I told him the light was green, you can go through. And he told me, it was like bleep, this, [ bleep ] that. Reporter a construction worker directing traffic at eightth and steiner this morning says words were exchanged and then the driver got out of his car. He just shoved me first. And when i went down i grabbed him by the tshirt. And after that it was just swing, swing, swing. Reporter two men driving by said it looked like a person on the ground needed help. We were like lets get out and help. Then we realize this guy is bashing on her for no reason. Reporter they said it seemed like the construction worker was on her own. We were surprised more people werent stopping him and i had to put my car in park in the middle of the intersection. Reporter the Good Samaritan says the man was big. The nagger took a picture of the man and his car once the crowd got him off her. I have one immediate bruise on my lower back. That one came in real quick. I feel like my ribs are sore and my stomach is sore because that is where he was mainly hitting me. Reporter she says she is grateful for the help and for the hard hat that helped absorb the impact of hitting the pavement. The construction worker turned those images over to police and then she finished her ship. Sfpd is investigating the assault tonight. Mob mentality. Tonight, bart Police Investigating the systems great train robbery. Dozens of teen thieves rushed onto a crowded train beating and robbing passengers. And we are getting the story of an elderly couple who saw it all happen. Nbc bay areas Terry Mcsweeney joins us live at the cole see yum bart station where it took place. This happened saturday night, terry, any arrests so far. Reporter a spokeswoman tells me tonight no arrests but police are poring over video obtained here at thecal see yum bart station saturday night. Aboard that train, a couple in their 70s, terrified. As many as 60 young people hopped the turnstyles saturday night and mobbed bart cars, robbing seven passengers of their money and phones, punching two this the face. They all kind of piled up on one person and started beating her up. It was like a melee. Reporter Jeffrey Sykes parents in their 70s were on board. They wouldnt talk for privacy reasons but told their son their story. They felt like they got incredibly lucky. Reporter lucky because they were not robbed. To have it all happen at once. Obviously, coordinated. They knew coming to the station thats a they were going to do. Reporter Officials Say they have seen this type of crime before but never committed by so many. It is something that curse frequently enough in that we know it is a problem and we have been working with law enforcement. Reporter bart police are everywhere at the cole see yum station tonight. Surveillance cameras are everywhere, too. And we are told most of them were working saturday night. Riders are reassessing their own security. Starting to look around me more. Holding my bags closer to myself. Just really made me nervous. Reporter bart says it is not releasing the video to the public because so many of the perpetrators are minors. But they are releasing it to local school districts. Live in oakland, Terry Mcsweeney nbc bay area news. Could we see military activity involving north korea . We are following this developing story at this hour. Its an extremely critical time for the United States as north korea is celebrating the anniversary of its army. This is all happening right now as the u. S. Aircraft carrier say arriving in the region. Nbc bay areas reporter joins us from the newsroom with the latest. Reporter u. S. Military sources say its likely the North Koreans will take some kind of action to mark this day. The big question is what and how they will do it and what the response will be from the United States. President trump didnt minutes words at white house meeting tonight, telling the u. N. Security council it needs to come down harder on north korea. The council must be prepared to impose additional and stronger sanctions on north Korean Nuclear and Ballistic Missile programs. This is a real threat. Reporter a threat the u. S. Isnt taking likely. North korea has already demonstrated its growing warfare, from a Missile Launch to five nuclear tests. Tonight the uss carl vinson moves into position near the Korean Peninsula while the u. S. Sub the michigan arrives in south korea. North korea is calling the deployment of an Aircraft Carrier extremely dangerous and issued the warning they will turn the ship into a huge pile of steel buried at sea. What you are seeing is kim jongun is starting to flex his muscles because he feels the pressure. Reporter still no mention from north korea about any of the three americans who are being held there. President trump has talked to both the leaders of japan and china, with chinas president urging restraint on all sides. Reporting from the newsroom nbc bay area news. A live look at the capitol now. Negotiations continue on a spending bill that needs to pass before friday to avoid a government shutdown. And a major Sticking Point may be off the table tonight. President trump is now easing up on the dmap for his the demand for his border wall to be funded as part of that deal. Mr. Trump told conservative reporters tonight he would be willing to find the money for the wall in september instead. New details about an speaker involved shooting in south san jose. Police say khan tran was threatening people with a knife near louis and officer roads. A San Jose PoliceDepartment Officer shot tran when he didnt put that knife down. Police rushed him to the hospital where he remains in critical condition. He is accused of killing and dismemmingen his neighbor after an argument but a peninsula man told the judge today he is not guilty. David stubblefield entered a plea. He is accused of shooting and killing his 77yearold neighbor last month. Prosecutors say he then cut up the body and left the remains in buckets to decompose behind his san bruno home. Look at 24 brazen attempted robbery in walnut creek. It happened last week. We are just now obtaining the video. Three men dressed as construction workers walked into the jewelry story. When they owner looked down at the clipboard the suspect pepper sprayed him. Another man broke the display case with a bat. The store owner and a nearby customer scared all the men off before they got away with anyone. A a big win tonight in portland and the warriors are moving to the second round of the playoffs. The question s will their leader steve kerr move with them. He watched tonights clincher on a locker room tv. We have a photograph of him earlier in the day. Kerr says pain, nausea and other complications from a back surgery in 2015 will keep him from coaching indefinitely. The coach spoke out yesterday, advising others to choose rehab over surgery. We talked with an Orthopedic Surgeon from the south bay who says thats good advice for some but it really does depend on the case. In some circumstances, surgery is really dramatically beneficial. Whats next for warriors . This is a live look at the arena, they will play either sunday or next tuesday in round two. Coming up in 20 minutes from now we will have highlights from tonights game. Giants pitcher miamidadeson bumgarner is nursing an injured shoulder and bruised ribs after falling off a dirt bike last week. Tonight he came clean addressing reporters for the first time. I mean, its terrible. Its obviously, that was not my intentions when we set out to enjoy the off day. But you know, i realize thats definitely not the most responsible decision i made. He was dirt bike riding last week in denver during the giants off day. Bumgarner was at the ballpark tonight. You can see the sling he is wearing. He might be out for two months. Well show you what the giants did without mad bum tonight. A big win. Just ahead, whats more important, safety or free speech . What students at berkeley told bus the ann coulter controversy. A potential crisis for a local company. A woman describes the moment she says her fit bit he can proceeded right there on her wrist. Meteorologist jeff ranieri. Clouds right now in San Francisco. Ill tell you when warmer 70s and 80s return in less than ten minutes. Yes, the toyota mirai runs on hydrogen. Yes, the fuel is complimentary for up to three years. Yes, it has an epaestimated range of 312 miles. Yes, you will probably have to answer lots of silly questions from strangers. Yes, this is a mindblowing marvel of technology. And, yes, you can buy it today because the future doesnt start next week, next month or next year. The future starts now. In the hydrogenfueled toyota mirai. Controversy. Public safety versus free speech. That is a debate tonight at cal over the coulter controversy. Now the free speech fight has turned legal. And its pitting students against each other over how, when, and if conservative political speaker ann coulter should be on campus. Nbc bay areas ian cole has the latest from berkely. It is ironic that a school known for open debate is in this position. Reporter jessica, the university is saying though that its main concern is public safety. Republican groups are saying cal is blocking free speech. It continues to be on the mind of cal students and the debate could end up in court. Trying to avoid another violent clash like this one in february, tonight uc berkeley grappling with mixing free speech and public safety. Its better to have that debate rather than violent protests. Reporter the university canceled an upcoming even with conservative comment at a timer ann coulter, then suggested she come the next week. Today College Republicans and coulter supporters sued the school saying cal is caving to threats and accusing berkeley of making special rules that only apply to speakers the university believe would attract vie help protests. In coulter will pretty much be allowed to speak at the same place, manner as liberal speakers on the campus. This is unconstitutional. Reporter the school says they have been working to accommodate a mutually agreeable time for miss coulters visit. Tonight the debate continues on campus. We would be more than welcome to have them bring on real conservative policy speakers. Reporter others offering solutions. If there were a lot of students who really didnt like ann coulter, why not get tickets, go to the even and slam her with questions and debate her at the event. Coulter tweeted she is still coming on thursday. Many students we spoke with say they dont mind if she comes even if they dont agree with her mess an of the they just dont want more damage or protests at their school. Ian cole, nbc bay area news. A Good Samaritan stopped an apparent kidnapping in San Francisco. It happened on saturday night in pacific heights. Police say the woman was talking down steiner street when a man drove up, got out of his car, and grab her. A witness then intervene. That prompted the man to drive away. He then led officers on a chase. After he hit two pedestrians, he was then taken into custody no. Word on the condition of the pedestrians. This isnt typical for one of the sachest cities on the peninsula. Tonight investigators in los altos are warning parents and students about a man trying to lure young girls into his car. This happened twice recently. Both times during the day near los altos high school. The man is said to be in his late teens or early 20s and is is driving a light gold colored sedan. He did expose himself to one of the girls. In Cheryl Sandbergs new book she is sharing the personal journey after the dead of her husband. No ones life is perfect. Some of the traumas are big, like losing a husband suddenly but and some of the traumas are small. But we all face them. What matters is what we do to fine the path forward. She says she is overcoming the hardship with the help of family, friends and her communities. Its supposed to keep you healthy and active. That wasnt the case for one woman. She claims they are pit bit caught on fire while she was wearing it is. The bay area based company is now on damage control. Our business and tech reporter scott budmans that details. Reporter look at these pictures. They have been blurred because of their graphic nature, but they are images of the seconddegree burn Dina Mitchell a milwaukee woman said she suffered after wearing her if i had bit flex 2 device for only two weeks. Fit bit itself totally melted. The bracelet melted. And i got pieces of plastic burned into my arm. Reporter pieces of plastic dina says her doctor had to pick out of her wound. According to mitchell, her fitness tracker exploded tuesday night while she was reading a book. She says there was no indication anything was wrong with the device prior to the explosion. And Aurora Health care confirms mitchell visited urgent care the very next day. This is a product so many people use. My nephew their whole class gets these from their teachers and they wear them. Reporter the device, however, does come with a warning. The fit bit website cautions consumers stating the device contains Electrical Equipment that could cause injury if not handled properly. Mitchell says she was very careful when wearing the device but that didnt prevent something from going wrong. If they are exploding or if there is some type of malfunction with them i mean, im going to have a scar from this probably. Can you imagine what it would do to a child . Reporter scott budman, nbc bay area news. We do have a Firm Response from fit bit tonight saying quote we are extremely alarmed about ms. Mitchells complaint regarding her flex 2 and we are investigating the issue. We are not aware of any other complaints of this nature. In fact, based on our extensive internal and independent safety testing we do not believe it is possible for this to occur under normal use. The quality of our products and the health and safety of our customers are top priorities. Fit bit products are designed and produced in accordance with strict standards to ensure the safety of our users. Lets bring in meteorologist jeff ranieri right now. We need to get over the next couple of days, and then you have promised i think it was 14 days of sunshine . Potentially, yes. What do we do with all that . 14 days . I know you are excited about that. A lot of folks at home are definitely excite approximated any kind of drying trend coming our way. Bear with me here. As jessica mentioned, just two more days here of on and off wet weather chances then we could be in thor cloo. I wanted to start off tonight with a look at our april rainfall averages. Because its off the charts this month. 371 puts us at 398 of average, 225 of average in oakland. And san jose, 171 . We have seen the most rainfall in april as weve seen since 2012. All of you are ready for dry weather. More coming up in the sevenday forecast. Right now we are at the mercy of the jet stream which is positioned across northern california. This will keep the on and off wet weather chances over the next two days. Tomorrow mornings forecast not look of thing at any rainfall for us. It will mainly be the clouds to start. Trivalley 48, peninsula 53, south bay at 51. North bay, 49, 49 in San Francisco, and 52 for the east bay. We will have a lot more sunshine. But you have to wait for it for tomorrow. In the future cast you will see we have clouds in the morning hours. By afternoon we clear out to a partly cloudy to mostly sunny skies. A much improved afternoon on tuesday. With that Sunshine Building in i think it will give us warmer temperatures. We will be up three to six degrees from what we experienced today. The winds will be breezy. I want you to focus in on that as we get to the micro climate. For the south bay, out of the northwest at 15. And 69 degrees. For the east bay well go as mild as 71 in antioch. 72 in concord. 70 in walnut creek. Cooler by the bay with 66 in hayward. Peninsula, palo alto, partly cloudy through the afternoon and 67. San francisco, 64, expected in the mission. And in the north bay, 65 in mill valley, and a warmer 71 in napa. Come a little bit closer to your tv. We have got a lot of details on the sevenday forecast. Lets get alook. Tomorrow only a 10 chance of a height is slight shower. Wednesday a 40 possibility of some scattered rainfall. Try on thursday. But then we get winds building in on friday. 20 to 40 Miles Per Hour gusts. That could take down some trees. We will watch this forecast closely. That win will turn dry they are weekend. That means low 70s in San Francisco. And also a lowering humidity. Well likely stay dry into next monday. The inland forecast, a lot warmer by saturday. 79 degrees. 82 on sunday. And heres where the drying trend starts to build in. Next monday still looking at low 80s. We think once we low 80s. Once we hit this weekend we could be in for a ten to 14day drying trend coming our way. Thats a long way to look out but im all about bringing wet to folks but all you want at home give the people what they want, surchl. For 14 days. Thanks. Up next, back in the spotlight but not in the way that democrats had hoped. Why barack obama is making headlines tonight. And we have jimmy. Hey guys. Kobe bryant is here. To answer questions from kid reporter max von set thor. Plus cat relationship haughn, music from big boy. Do not change the channel. Its good. Happening on our twitter page towards ruling out the possibility of a tsunami in chile where a 6. 9 magnitude squak struck just a few hours ago. Big honors for big sports names in local sports history. They were inducted into the bay area sports hall of fame. Among them, kerry walsh jennings. And bill cart wright. Back in a moment. Hey, bud. You need some help . No, im good. Come on, moe. I have to go. vo we always trusted our Subaru Impreza would be there for him someday. Ok. Thats it. vo we just didnt think someday would come so fast. See ya later, moe. vo introducing the allnew Subaru Impreza. The longestlasting vehicle in its class. More than a car, its a subaru. This man, who they say spray painted graffiti on businesses, ar new at 11 o, Petaluma Police are looking for this man who they say spray painted graffiti on business, cars and street signs. Police say he tagged 12 businesses three cars along East Washington street in petaluma. It is over. The search this evening for a santa rosa couple who rannished while flying home from lake tahoe. They took off from truckee headed for petaluma. No emergency signal was detected but a cell phone pinning was observed 20 miles from where the plane took off. A machine lion smuk into a home and snatched a familys dog. A woman and her daughter leave the back door open for fresh air and so their dog can come and go. Last monday as they slept one of their two dogs started barking and then suddenly went silent. They found paw prints on the floor and a wam warden found blood on the bedroom door. The blood belonged to a dog but contained trace amounts of Mountain Lion dna. The giant rookie broke down in tears. Well explain why. The warriors are moving on to round 2. Raj 2hot round one no problem. Raj vo got to be excited. The warriors are moving on to round two. Round one was no problem. Steve kerr is out. We mentioned that. And could be out for the remainder of the playoffs. This is acting head coach mike brown. Not much coaching needed on the. Just give the ball to k. D. Kevin durant back from that sore calf. Ten points in limited action. Steph curry had a game high 37 points. Dude was all over the place. Warriors beat the trail blazers 128103 to complete the sweep. The warriors will play either the jazz or the clippers as early as sunday in oakland. The strungling giants are shaking things up. Today they brought up the kid from the minor leagues. Christian arroyo. There he is, right in the middle. 21 years old. Doesnt even look like he shaves yet. He is young. He didnt get a hit in the game but he will get plenty of chances. Giants and dodgers. Matt hayne was sparkling, throwing a shutout in the seventh inning. Left with a hamstring injure. Just minor. Hunter pence with the game winning run eventually. Giants win 21 against the dodgers. Getting back to the rookie arroyo, he describe his reaction when he got called up to the big lesion this afternoon. Ended up breaking down and crying because its been a lot of work. And i immediately gave everyone a hug and then i called my mom and my mom started crying too. Of course she did. Have a good cry. Welcome back. Well be right back. Former president barack obama, breaking his silence today in his first public event since leaving office. He spoke about the cur former president barack obama breaking his silence in his first public event since leaving office. He spoke about the current Political Climate at the university of chicago. The single most important thing i can do is to help in any way i can prepare the next generation of leadership. Mr. Obama did not mention President Trump at all. President obama kept a low profile since leaving office kite surfing in the caribbean and vacationing. A well deserved vacation. Looked very relaxed today. Thanks for joining us. We will see you back here tomorrow. Byebye. Steve from studio 6b in Rockefeller Center in the heart of new york city, its the tonight show starring jimmy fallon. Tonight, join jimmy and his guests kobe bryant. Kathryn hahn